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Finding the Fourth Proportional to 781.12, 1,169.76 and 472.64

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Solution

The fourth proportional to 781.12, 1,169.76 and 472.64 is: 707.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.12 : 1,169.76 = 472.64 : x
  2. Step 2: Convert to fraction form
    781.12/1,169.76 = 472.64/x
  3. Step 3: Cross multiply
    781.12x = 1,169.76 × 472.64
  4. Step 4: Simplify right side
    781.12x = 552,875.37
  5. Step 5: Solve for x
    x = 552,875.37/781.12
  6. Step 6: Final answer
    x = 707.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.